Foursquare released an update to its iOS app with an important new feature: the ability to check-in your friends, but only with their permission. You can check them in, but they’ll have to navigate into the app to approve your check in request. Tapping once to approve a check-in is much less hassle than the original process, and at the same time Foursquare increases the chances of more people checking into more places, exclusively through one click-happy friend who checks in the whole gathering. It’s very easy to see how this could boost check-in numbers across the board, and cold be a widely utilized feature by fans of the app.